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Infrared Spectroscopy of Hydrogen in ZnO

Published online by Cambridge University Press:  17 March 2011

M.D. Mccluskey  and
S.J. Jokela
M.D. Mccluskey
Affiliation:
Department of Physics, Washington State University, Pullman, WA 99164-2814, U.S.A.
S.J. Jokela
Affiliation:
Department of Physics, Washington State University, Pullman, WA 99164-2814, U.S.A.
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Abstract

Zinc oxide (ZnO) has shown great promise as a wide band gap semiconductor with optical, electronic, and mechanical applications. Recent first-principles calculations and experimental studies have shown that hydrogen acts as a shallow donor in ZnO, in contrast to hydrogen's usual role as a passivating impurity. The structures of such hydrogen complexes, however, have not been determined. To address this question, we performed vibrational spectroscopy on bulk, single-crystal ZnO samples annealed in hydrogen (H2) or deuterium (D2) gas. Using infrared (IR) spectroscopy, we have observed O-H and O-D stretch modes at 3326.3 cm−1 and 2470.3 cm−1 respectively, at a sample temperature of 14 K. These frequencies are in good agreement with the theoretical predictions for hydrogen and deuterium in an antibonding configuration, although the bond-centered configuration cannot be ruled out. The IR-active hydrogen complexes are unstable, however, with a dissocation barrier on the order of 1 eV.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 813: Symposium G – Hydrogen in Semiconductors , 2004 , H3.2
Copyright
Copyright © Materials Research Society 2004

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